受益于非富勒烯受体的不断发展，近年来有机光伏器件的性能得到长足进步。传统富勒烯受体有机光伏体系下建立起来的电荷拆分和能量损耗模型，不完全适用于非富勒烯受体体系。我们利用超快光谱学方法，发现在模型体系中，非富勒烯受体畴内非局域激发态代替界面电荷转移态介导了电荷拆分的空穴转移通道，在很小的驱动能下实现高效电荷拆分。非富勒烯体系中双分子复合过程在能量损耗中扮演重要角色，分子氟化设计可以改变能级排列，抑制双分子复合产生的三线态，从而抑制损耗。分子间相互作用调控关键能级位置，可用以调控非富勒烯光伏体系光电流产生机制，有效抑制损耗通道，进一步提升有机光伏体系的效率。

The performance of organic photovoltaic (OPV) device has been improved rapidly benefiting from the development of non-fullerene acceptors (NFAs). In these new systems, the mechanism models developed in conventional OPV systems with fullerene acceptors are not fully valid for describing the generation and recombination processes of photo charges. Here, we summarize recent studies on the excited carrier dynamics using ultrafast spectroscopy. In the model systems, an intra-moiety state arising from the molecule interaction mediates the hole transfer channel, allowing charge separation at a small interfacial driving energy. Moreover, the bimolecular recombination plays an important role in voltage loss in OPV blends with NFAs, which can be strongly suppressed by manipulating the alignment of interfacial and local triplet states. The energy landscape of key levels, susceptible to the molecular interaction, is essential for charge generation and recombination, which can be manipulated for future device optimization.